【正文】 2 具有較好的社會、生態(tài)、節(jié)水效益 ........................................................................................................ 12 4 供需平衡分析 ......................................................................................................................... 13 可供水量分析 ................................................................................................................................................ 13 灌區(qū)需水量分析 ............................................................................................................................................ 13 供需平衡分析 ................................................................................................................................................ 13 5 工程規(guī)劃與設(shè)計 ..................................................................................................................... 14 工程等級 ......................................................................................................................................................... 14 工程規(guī)模 ........................................................................................................................................................ 14 總體布置 ........................................................................................................................................................ 14 工程總體布置 ............................................................................................................................................. 14 灌區(qū)田間布置 ........................................................................................................................................... 14 灌溉方案的比較 ........................................................................................................................................ 14 灌溉制度確定 ................................................................................................................................................ 15 灌溉制度的擬定 ........................................................................................................................................ 15 設(shè)計灌水定額和設(shè)計灌水周期 ............................................................................................................... 15 管灌設(shè)計次數(shù)和輪灌制度 ........................................................................................................................ 17 給水栓的作業(yè)方式 .................................................................................................................................... 17 水源工程設(shè)計 ................................................................................................................................................ 19 廊道尺寸的確定 ........................................................................................................................................ 19 廊道結(jié)構(gòu) ..................................................................................................................................................... 19 灌溉工程設(shè)計 ................................................................................................................................................ 19 管徑選擇 ..................................................................................................................................................... 20 水頭損失的計算 ........................................................................................................................................ 20 管網(wǎng)配套技術(shù) ................................................................................................................................................ 25 管道設(shè)計 ..................................................................................................................................................... 25 閥門井設(shè)計 ............................................................................................................................................... 25 給水栓、排水栓 ........................................................................................................................................ 25 6 工程施工 ............................................................................................................................... 26 施工條件 ......................................................................................................................................................... 26 ................................................................................................................................................. 26 對外交通 ..................................................................................................................................................... 26 主要建筑材料來源 ..................................................................................................................................... 26 .................................................................................................................................................... 26 施工條件 ..................................................................................................................................................... 26 施工進(jìn)度 ..................................................................................................................................................... 26 施工方法 ..................................................................................................................................................... 26 設(shè)備、材料選型 ......................................................................................................................................... 27 7 環(huán)境影響評價 ......................................................................................................................... 28 評價依據(jù)、標(biāo)準(zhǔn)和年限 .........................